unclassifiable, original music, and impossible to define in simple terms...

Something more usual on an unusual instrument : the harp guitar

https://www.youtube.com/watch?v=SVDOfeyVEqk

Van Dyke Parks comes to mind. He doesn't have a website, but his Wikipedia write-up will give you his outline.

Lately I've been devoted to abstract bands such 

Atrax Morgue and Zoviet France. They are of a distinctive styles, but both into dark ambient.

I was also fascinated by album of well known Jim O'Rourke "I'm Happy and I'm Singing and 1,2,3,4"

Here are some interesting instruments (simple YT search).

My favorite is the more common dulcimer type instrument (# 3 in the first link I think) due to the music choice and the musician). 

https://www.youtube.com/watch?v=3EPdeQTTFt8

https://www.youtube.com/watch?v=_8ple6h4zWA

DeKay

Interesting stange instruments.... Thanks...